func (s *storageBtrfs) ContainerStorageReady(container container) bool {
	containerMntPoint := getContainerMountPoint(container.Project(), s.pool.Name, container.Name())
	return isBtrfsSubVolume(containerMntPoint)
}
func (s *storageBtrfs) ContainerStorageReady(container container) bool {
	containerMntPoint := getContainerMountPoint(container.Project(), s.pool.Name, container.Name())
	return isBtrfsSubVolume(containerMntPoint)
}
// Functions dealing with container storage.