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While this is used by the majority of upper container runtimes, it was not needed for runc itself. Since commit515f09f7
runc uses overlay, too, so let's add a check for this. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> (cherry picked from commitee1bced18c
) Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>