I have wu-ftpd setup on my box. I have created a handful of FTP users. For better or worse, each user is a member of the same "FTP" group. When each respective user logs in, they chroot to their home ftp directory. I noticed that one user can change into another user's directory and other "sensitive" areas of the filesystem. How do I restrict each user from having this ability. I want them to be restricted to their respective home FTP directories.