title: Git tf checkin --deep command doesn't work as required
body: <p>I am doing migration from git to tfs, while doing checkin using git tf checkin --deep command but even with --deep the checkin will lose the info about who was the original commiter, and reassign all commits with current user executing the checkin. while doing migration i dont want to lose info about who did original checkin so can you anyone tell which command will help in this.</p>
  
  <p>Thanks and Regards</p>
  
  <p>Dushyant Padhya </p>