Eu não tenho certeza, mas você deve ser capaz de fazê-lo conforme descrito abaixo.
Grant Write permission for the Users group that is applied to This Folder only. (This is an option available on the Advanced page.)
If each user needs to have certain permissions to the files that he or she dropped, you can create a permission entry for the Creator Owner well-known security identifier (SID) and apply it to Subfolder and files only. For example, you can grant the Read and Write permission to the Creator Owner SID on the drop folder and apply it to all subfolders and files. This grants the user who dropped or created the file (the Creator Owner) the ability to read and write to the file. The Creator Owner can then access the file through the Run command by using \ServerName\DropFolder\FileName.
Grant Full Control permission to the group manager.
Citação da Microsoft TechNet: