80b8eb2c_w_to_use_Sync_task___Java_Tips__1
[0] granularity [1] 
The number of milliseconds leeway to give before deciding a file is out of date. This is needed because not every file system supports tracking the last modified time to the millisecond level. Default is 0 milliseconds, or 2 seconds on DOS systems. This can also be useful if source and target files live on separate machines with clocks being out of sync. since Ant 1.6.2.
How to use Sync task - Java Tips