Unmount btrfs subvolume from tree

On an btrfs volume, I have a folder snapshots/ in which I store a snapshot of the whole volume from time to time.

btrfs automatically mounts all subvolumes, eg. after mounting the top volume, snapshots/ is populated with all snapshots ever done.

Now I like to unmount the subvolumes in snapshots, leaving snapshots empty (without deleting the snapshots of course). This is very useful if I do backups, indexing or searching on the volume, which otherwise always needs to be limited in a tool-dependent fashion to exclude snapshots/, which is not always easy.

As the subvolumes are not mounted by keel, I cannot unmount them with mount. How to unmount them?

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