When a user with read permissions is connected in sharepoint by Filamente Light, the user don’t see anything in “Sites and Workspaces.”

For a user to see sub sites, he or she will need to have a “Browse Directories” permission. This following article shows how to configure the Browse Directories permission: http://aircreek.com/blog/2012/how-to-configure-read-permission-level-to-browse-directories-in-sharepoint-2010-and-office-365/