title: How do you find who merged a git commit into a branch?
body: <p>There is a file in our git repository in work, I want to find out who merged this file into a branch.</p>
  
  <p>I have the commit hash that identifies the commit (lets say <code>552a976f1a25f9bad57efb9455e951f6b7b3367f</code>) that introduced the file, and I know that the file is on the branch <code>staging</code>.</p>
  
  <p>How can I find the hash of the commit that merged the commit above into the <code>staging</code> branch? I want to find the user who merged, and the date of the merge.</p>