when a file/folder filter is associated to a folder, the user browsing that folder won't see ALL files but only some of them.
he will see those matching the filter.
a simple filter is *jpg this means that the client will see any file ending by "jpg".
another simple filter is birthday*: the client will see only files starting by "birthday".
the way you can construct filter will be (in the future) explained in details in the documentation.
