Files and directories of a directory mounted later will override
those of a directory mounted earlier.
If dir has a parent in the VFS, a parent-less copy will be created and
mounted. (This has no effect whatsoever on the underlying filesystem -
it just removes the need for directories to have multiple parents).
VFSMountException if a directory with the same name is
already mounted, or if dir has this directory as its child
or a child of any of its subdirectories (circular mounting).
Mount a directory.
Files and directories of a directory mounted later will override those of a directory mounted earlier.
If dir has a parent in the VFS, a parent-less copy will be created and mounted. (This has no effect whatsoever on the underlying filesystem - it just removes the need for directories to have multiple parents).