Webadmin / Granting FTP folder access to users

Despite that when creating a  new user I selectively customise his folders access levels ( e.g. 1 or 2 websites only), the user can still modify every website under the current webadmin.
 
Please advise
 
Thank you

Didn't you apply HC8 version build9 ?
In it panel allow to set ftp user home directory path to a specific domain folder. So there is no way that single user could access multiple sites.