You can use the detailed vfs permissions in ioFTPD.ini for this. For example if you've mapped both groups homedirs to the same virtual name in their vfs:
Code:
[VFS]
MakeDir = /home/* *
Upload = /home/* *
Download = /home/* =groupB !=groupA !*
DeleteOwn = /home/* =groupB !=groupA !*
RenameOwn = /home/* =groupB !=groupA !*
But don't forget to always keep the default permissions at the bottom to not screw up the permissions for the rest of the site. Example:
Code:
Download = /home/* =groupB !=groupA !*
Download = * *
/ZR