[Zope] Zope and roles and hierarchy

Hello Zope, Is it true that even though a user Role like 'author' is defined at zope root that users defined lower in the hierarchy *also* with role 'author' cannot access objects at root with role 'author' and permissions of view and access? The online zope book seems to say so. If so, couldn't we have some extra attribute to a role like "upwardly mobile"? (I want to share a code base for several folders sub-folders and I do not wanta to give it anonymous access). David