It is possible to make a folder secret or even define which users will have access to it.
This function, in addition to limiting access to sensitive documents, hides the folder from other users, preventing anyone from trying to access it. See how simple it is:
Click on the "pencil" icon to edit the folder, and then click on the "secret" flag to restrict access to other people. You can either make the folder private only for yourself or specify who else will have access. The owner will always have access to all folders.
You can click the "x" to remove any of the users or disable the "secret" flag so that all users on the account can access it.