title: git ls-files sort by modification time
body: <p>How can I list files sorted by their modification time? </p>
  
  <p>I want the git modification time, not the system modification time. For example, if I have a (committed) file <code>README</code>, then</p>
  
  <pre><code>touch README
  </code></pre>
  
  <p>will change the system modification time... but the git status would remain unchanged.</p>
  
  <p>If I try</p>
  
  <pre><code>git ls-files -z | xargs -0 ls  -t
  </code></pre>
  
  <p>this will sort by the system modification time.</p>
  
  <p>Is there any option to <code>git ls-files</code> that would list files sorted by their git modification time?</p>