How to force owner of a shared windows folder?

I have a directory of shares:

D:\share\users\user1
D:\share\users\user2
D:\share\users\otheruser1
D:\share\users\yougettheideaithink

Each user folder is the owner of their folder.
Each user has what is supposed to be a 'dropbox' style shared folder called "Scans"

D:\share\users\user1\scans
D:\share\users\user2\scans

The user "svc_scan" has permission to write to the scans folder. The problem is that because the svc_scans user can write to it, it's owned by him and 'user1' can't see it. How do i force the owner of "user1"?