local: only walk the subdirectory designated by prefix #212
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This fixes issue #140.
When listing items using the local-file-system driver, only
traverse the subdirectory with longest prefix that contains
the given listing prefix.
Three cases are of interest:
a. The listing prefix is foo/bar/ - we walk subdirectory
foo/bar
under the container's path.
b. The listing prefix is foo/ba - we walk subdirectory
foo
underthe container's path, and filter stuff that doesn't begin with
foo/ba
.c. The prefix is an empty string - walk the container's path like
today.
There's a rather aged PR for this issue - #149. However that PR has some issues - it uses path instead of filepath when filepath is required, and it doesn't take into account case c above. Because it's rather old, I opted to proposing another fix instead of commenting on the exising PR.