title: How can I mirror a directory in a git repo into another git repo?
body: <p>I have a directory <code>/amp</code> in <code>RepoA</code> and a <code>RepoB</code> (populated with the contents of /amp initially). I want to mirror any changes to the  <code>/amp</code> in RepoA into RepoB. </p>
  
  <p>Is it possible ?</p>
  
  <p>P.S: RepoA contains many other directories. I only want to mirror the /amp dir. Whereas RepoB is only going to have the /amp contents not any other.</p>