Create ftp account with custom directory

Hello,

I would like to create an ftp account that is jailed to a specific folder under one of my domains.
How could I achieve this?

The options given to me in the web interface are only limited to creating new folders and the entire domain's folder.
So if my domain's folder is domain_com how do I restrict a user to "domain_com/specific_folder"

instead of the entire domain_com folder?

Thanks in advance