filtering Object Store on Windows CE 7.0

Hey All,
We are looking to implement a solution which requires us to filter file systems on Windows CE 7.0. From what we understand from the following link is that we cannot filter the Object Store.

http://blogs.msdn.com/b/ce_base/archive/2005/12/01/499052.aspx

Though in the comments section it says that we can filter the RAM disk FS in Windows CE and that can be used here. Since OBJFS is itself a file system for Object Store it is not clear to me how we can do this. Has anyone done this and can point me in the right direction here.