I guess you need just that particular directory and no other changes which were introduced in different branches, if that is the case then, one way which comes to my mind right now is git cherry-pick
.
Just check git log
and find out the commit id responsible for adding that new directory and everything else you need. Now checkout your other branches one by one and use
git cherry-pick <commid id>
And that particular commit will be applied to that respective branch.