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Union maps
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The union map support is provided specifically for use with the union
filesystem, see Union Filesystem..
It is identified by the string `union:' which is followed by a colon
separated list of directories. The directories are read in order, and
the names of all entries are recorded in the map cache. Later
directories take precedence over earlier ones. The union filesystem
type then uses the map cache to determine the union of the names in all
the directories.
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