Spygroup Help

Does anybody know how to set spygroup to limit access to chanspy. I have gotten chanspy setup with password protection. I have also set it so a manager can specify the extension to be spied on but I would like that manager to only have access the phones for employees who work directly under him. I don’t want this manager to have access to spy on his superiors.

I have searched through the posts and not found anything I can make work. any suggestions or help would be much appreciated.