Moving data between two mounts of the same CephFS

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Dear Ceph community,

Let's say I want to make different sub-directories of my CephFS 
separately available on a client system,
i.e. without exposing the parent directories (because it contains other 
sensitive data, for instance).

I can simply mount specific different folders, as primitively 
illustrated here:

CephFS root:
- FolderA
- FolderB
- FolderC

Client mounts:
- MountA --> cephfs:/FolderA
- MountB --> cephfs:/FolderB

Now I'm wondering what actually happens in the background when I move 
(not copy) data from MountA to MountB.
In particular, is CephFS by chance aware of this situation and actually 
performs an atomic move internally?
Or is more like a copy and unlink operation via the client?

I appreciate your thoughts.

Best wishes,
Mathias

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