At least when running under Docker this seems to cause some issues,
possibly also explains some other oddnesses.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
At present they use a small shared function called "prepare"
that does the read-write remounts, that I will switch to doing overlay
mounts soon.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>