cp command option :
-x, --one-file-system
stay on this file system
sometimes does not stay on the same filesystem.
using cmd line :
cp -r -u -p -x -f -v --target-directory='/abc/def/123/456/xx" /home
or
cp -rupxfv --target-directory='/abc/def/123/456/xx" /home
where '/home' is mounted on a different volume than '/'.
Detected by a call from python with os.popen().
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