Starts a @mount_operation, mounting the volume that contains
the file @location.
When this operation has completed, @callback will be called with
@user_user data, and the operation can be finalized with
g_file_mount_enclosing_volume_finish().
If @cancellable is not %NULL, then the operation can be cancelled by
triggering the cancellable object from another thread. If the operation
was cancelled, the error %G_IO_ERROR_CANCELLED will be returned.
Starts a @mount_operation, mounting the volume that contains the file @location.
When this operation has completed, @callback will be called with @user_user data, and the operation can be finalized with g_file_mount_enclosing_volume_finish().
If @cancellable is not %NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error %G_IO_ERROR_CANCELLED will be returned.