Sub folder permissions

Our vault "Product Data" has various sub folders. One is called "Projects" and under that is many sub-folders of various projects.

C:\Product Data\Projects

    

How can I give a group of users access to only one of those project subfolders? I tried creating a group called "Project Team member" Then added a location for just that user:

"C:\Product Data\Projects\X90000

However they can't see it unless I also add "C:\Product Data\Projects" However doing that allows them to see all projects. I expected it to work like at the root level where you don't have anything checked for the vault root but give various sub-folder access. However it doesn't appear to work further down from the vault root, you have to give parent folder access.

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