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Previously a callback was used to list path contents and if no sort was specified then a snapshot was not required. When deleting files from the path some filesystems could omit files that still existed, which meant the path could not be removed. Filter . out of lists in the Posix driver since this special entry was only used by test code (and filtered everywhere in the core code). Also remove callbacks from the storage interface and replace with an iterator that should be easier to use and guarantees efficient use of the snapshots.