title: Fast list of top level directories in a tar
body: <p>I have a tar file that is over 100gb in size, with thousands of files in, and I'm trying to find a way to list the top level but fast.</p>
  
  <p>I've seen people using --exclude and grep but this still has to go through all of the file names first, which in my case take a very long time.</p>
  
  <p>Is there a way to do this?</p>