Comment chrooter un groupe d'utilisateur

# This is a basic ProFTPD configuration file (rename it to
# 'proftpd.conf' for actual use.
(...)
# Default root can be used to put users in a chroot environment.
# As an example if you have a user foo and you want to put foo in /home/foo
# chroot environment you would do this:
DefaultRoot /home/foo foo

# only users who are a member of
# the group 'users' and NOT a member of 'staff' will have their default
# root directory set to '~'.
DefaultRoot ~ users,!staff