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The `--one-file-system' (`-l') option causes tar to modify its
normal behavior in archiving the contents of directories. If a file in
a directory is not on the same filesystem as the directory itself
(because it is a mounted filesystem in its own right), then tar
will not archive that file, or (if it is a directory itself) anything
beneath it.
This does not necessarily limit tar to only archiving the
contents of a single filesystem, because all files named on the
command line, or through the `--files-from=file-of-names' (`-T file-of-names') option, will always
be archived.
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