How to convert Pandas Timestamp into nano since Epoch?
<p>What is the most efficient way to convert Pandas Timestamp into nano since Epoch?</p>

<pre><code>import pandas as pd
ns = 1470924597871000000   
timestamp = pd.to_datetime(ns, unit="ns")
</code></pre>

<p>Then how to</p>

<pre><code>timestamp =&gt; 1470924597871000000  ns???
</code></pre>