Remounts a mount.
This is an asynchronous operation, and is finished by calling remount.end with the
this and AsyncResults data returned in the
Remounting is useful when some setting affecting the operation of the volume has been changed, as these may need a remount to take affect. While this is semantically equivalent with unmounting and then remounting not all backends might need to actually be unmounted.
flags affecting the operation
a MountOperation or null to avoid user interaction.
optional Cancellable object, null to ignore.
a TaskReadyCallback, or null.
user data passed to