Unraid User 1223.

I have a question I could use some help with: I'd like to specify what is shared to certain users on this unassigned device hard drive. It seems to be all or nothing for all unassigned device shares. I'd like to give a certain user read-write access to one folder and disallow access to another folder of the drive. Is there a way to keep the drive off the array while being able to specify which users have read / write access to specific folders on the drive? I am relatively new to unraid and would like to be able to have a backup drive in my unraid server for the super important stuff, especially since it's the only PC behind a good UPS. I have installed unassigned devices and user scripts to automatically backup important files on the main array with rsync. Ideally I would keep it as NTFS file system to make it compatible with windows just-in-case... but looks like in a future version of unraid I will be able to just pop it into another array pool and create more than 1 user share on the drive.