Nope, I do not mean the "mime type", but types like "Invitation Letter" or "Bill" or "Payment Request" or any arbitrarily defined type. So when going to file-storage folder view you will see all "Bills" if you have the permission to read files of the type "Bill". But as I mentioned this is not limited to files, it is also the permissions on types of projects and types of users (e.g. a student administrator can change student data but can not change data from a fellow administrator let alone a professor. Only the HR supervisor is allowed to change data on these).