diff --git a/docker_explorer/de.py b/docker_explorer/de.py
index d558e9c..286966f 100644
--- a/docker_explorer/de.py
+++ b/docker_explorer/de.py
@@ -257,6 +257,9 @@ class DockerExplorer(object):
           container_object.start_timestamp)
       container_json['image_name'] = container_object.config_image_name
 
+      if container_object.mount_id:
+        container_json['mount_id'] = container_object.mount_id
+
       result.append(container_json)
 
     return result

diff --git a/tests.py b/tests.py
index 48fef64..70363c4 100644
--- a/tests.py
+++ b/tests.py
@@ -176,6 +176,8 @@ class TestAufsStorage(DockerTestCase):
          '7968321274dc6b6171697c33df7815310468e694ac5be0ec03ff053bb135e768',
          'container_id':
          '7b02fb3e8a665a63e32b909af5babb7d6ba0b64e10003b2d9534c7d5f2af8966',
+         'mount_id':
+         'b16a494082bba0091e572b58ff80af1b7b5d28737a3eedbe01e73cd7f4e01d23',
          'start_date': '2017-02-13T16:45:05.785658',
          'image_name': 'busybox'}
     ]
@@ -339,6 +341,8 @@ class TestOverlayStorage(DockerTestCase):
          '5b0d59026729b68570d99bc4f3f7c31a2e4f2a5736435641565d93e7c25bd2c3',
          'container_id':
          '5dc287aa80b460652a5584e80a5c8c1233b0c0691972d75424cf5250b917600a',
+         'mount_id':
+         '974e2b994f9db74e1ddd6fc546843bc65920e786612a388f25685acf84b3fed1',
          'start_date': '2018-01-26T14:55:56.574924',
          'image_name': 'busybox:latest'}
     ]
@@ -494,6 +498,8 @@ class TestOverlay2Storage(DockerTestCase):
          '8ac48589692a53a9b8c2d1ceaa6b402665aa7fe667ba51ccc03002300856d8c7',
          'container_id':
          '8e8b7f23eb7cbd4dfe7e91646ddd0e0f524218e25d50113559f078dfb2690206',
+         'mount_id':
+         '92fd3b3e7d6101bb701743c9518c45b0d036b898c8a3d7cae84e1a06e6829b53',
          'start_date': '2018-05-16T10:51:39.625989',
          'image_name': 'busybox'}
     ]

Go from overlayFS ID to container ID
It would be useful to find a way to map an overlayFS ID to the container that actually used it.

e.g. given this path on a server running Docker:

`/mnt/docker/var/lib/docker/overlay2/6688ce711806faead06aae3ff534ab21183a087241d3a890741f0c3b437b179c/diff/var/tmp/malware`

Find out in which container 6688ce711806faead06aae3ff534ab21183a087241d3a890741f0c3b437b179c is being used.
tests.py::TestAufsStorage::testGetContainersJson tests.py::TestOverlayStorage::testGetContainersJson tests.py::TestOverlay2Storage::testGetContainersJson
tests.py::UtilsTests::testFormatDatetime tests.py::UtilsTests::testPrettyPrintJSON tests.py::TestDEMain::testDetectStorageFail tests.py::TestDEMain::testParseArguments tests.py::TestAufsStorage::testDetectStorage tests.py::TestAufsStorage::testGetAllContainers tests.py::TestAufsStorage::testGetFullContainerID tests.py::TestAufsStorage::testGetHistory tests.py::TestAufsStorage::testGetLayerInfo tests.py::TestAufsStorage::testGetOrderedLayers tests.py::TestAufsStorage::testGetRepositoriesString tests.py::TestAufsStorage::testGetRunningContainersList tests.py::TestAufsStorage::testMakeMountCommands tests.py::TestOverlayStorage::testDetectStorage tests.py::TestOverlayStorage::testGetAllContainers tests.py::TestOverlayStorage::testGetFullContainerID tests.py::TestOverlayStorage::testGetHistory tests.py::TestOverlayStorage::testGetLayerInfo tests.py::TestOverlayStorage::testGetOrderedLayers tests.py::TestOverlayStorage::testGetRepositoriesString tests.py::TestOverlayStorage::testGetRunningContainersList tests.py::TestOverlayStorage::testMakeMountCommands tests.py::TestOverlay2Storage::testDetectStorage tests.py::TestOverlay2Storage::testGetAllContainers tests.py::TestOverlay2Storage::testGetFullContainerID tests.py::TestOverlay2Storage::testGetHistory tests.py::TestOverlay2Storage::testGetLayerInfo tests.py::TestOverlay2Storage::testGetOrderedLayers tests.py::TestOverlay2Storage::testGetRepositoriesString tests.py::TestOverlay2Storage::testGetRunningContainersList tests.py::TestOverlay2Storage::testMakeMountCommands