Make sure btrfs mounted subvolumes are owned properly when a remapped
root exists (user namespaces are enabled, for example)
Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp)
Upstream-commit: 72e65e87935e5b82de76a6ef9b8160900f4724b7
Component: engine