title: Hg - Find tags that "cover" specific file version
body: <p>We use hg to control the sources for a large project. Whenever we do a release, we tag the version in hg.</p>
  
  <p>Now say I take a specific revision (where I've fixed a bug for example). I want to know which releases contain this fix, i.e. which tags "cover" this revision.</p>
  
  <p>How do I find this? In hg tags seem to refer only to the tagged changeset. I remember that in ClearCase every ancestor of the tagged revision would be marked too, is there a way to see this information in hg?</p>
  
  <p>Thanks!</p>