I have read up on that and it doesn't accompilsh that.
What it does is you have to create a user, then map a subdirectory to that user. However, since that subdirectory is not stored on your main site's directory, you cant access it via local directory calls. You need to login via that user's FTP info in order to access those files.
This makes transferring files from that person's directory to my website's directory very time consuming. I basically have to download everything from his directory, then re-upload it to mine.