Comment display

Hello,

I would like to display comments only if the user is a member of the group. And hide them from guests and non-group users.
In the following file, would there be a similar code as $this->my->guest for groups ?
For example : $this->group->isMember()

File : /administrator/components/com_easysocial/includes/stream/stream.php
Code :

		if ($comments && $this->my->guest && $this->config->get('stream.comments.guestview')) {

Thank you,
Philippe