How to pull force just one folder in dev tree?

If I am in my source code tree down deep in a directory at the command 
line, how do I pull from a repo and force overwrite all files locally 
(and also get files that I deleted locally, just in the folder I am in?)

I do not want to do this for the entire repo, just the directory that I 
am in and also on the branch I am in.  I am not in the 'master' branch, 
but another branch.

so

  $git reset --hard HEAD

  Would probably do my entire local repo and from 'master' (even if I am 
not on master)?

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I want to git force pull from the branch I am on locally (tracked to a 
branch on a remote bare repo) and force overwrite of all files locally & 
also get the files I may have deleted locally from the file system (not 
files deleted through git).

How do I practice this to see what would happen (or revert) your 
solution if there are problems?