How do I delete or show the size of a non-TimeMachine APFS snapshot tmutil not only stores Time Machine snapshots, but also snapshots for other applications. E.g.:

~% tmutil listlocalsnapshots /
com.econtechnologies.chronosync.236A7A4F-5F96-4F99-8559-57D3965BF6BA.1575374525


This is a snapshot from a backup/sync application called ChronoSync.

My question: How can I determine the size it takes on my hard disk, and how can I delete it?

I'm using High Sierra, and there is no hidden /.MobileBackups folder, nor is anything (other than my hard disk) mounted at /Volumes.

Edit: I can mount the snapshot using the following commands:

~ » sudo mdkir /tmp/snapshotbackup
~ » sudo mount_apfs -s com.econtechnologies.chronosync.236A7A4F-5F96-4F99-8559-57D3965BF6BA.1575374525 / /tmp/snapshotbackup


From there, I can determine the size:

~ » sudo du -sh /tmp/snapshotbackup/
204G


Clearly, this is a stray snapshot that is causing my disk to fill. However, that 204G is so large (on a 250 G disk), that is surely contain files also present on my hard disk (I kind of assume APFS uses hard symlinks here). However, I'm hesitant to delete and files from /tmp/snapshotbackup/ fearing I may thus delete (hardlinked) files from my regular disk (not likely, but I prefer to be cautious).

So I still have the question how can I determine the size this snapshot takes on my hard disk, and how can I delete it?
I received a reply from the author of ChronoSync, and he helpfully explained the following option to manage snapshots.

To list snapshots:

diskutil apfs listSnapshots /


To delete snapshots:

diskutil apfs deleteSnapshot / -name &lt;name_of_snapshot&gt;


This seems the better option, which unfortunately doesn't seem listed elsewhere (all other guides I found only mention tmutil).
I couldn't test, since I already deleted it with CCC.