FTP How to Restrict users to public_html

I’ve followed the instructions at…

http://doxfer.webmin.com/Webmin/ProFTPD_Server

…to try and restrict users to their public_html folder. I get the same result as shown in the image under …

Restricting users to their home directories

…and nothing seems to change. I can still login and see the parent folders to public_html.

How do I apply this restriction?