(samba/cifs) Sharing folders and HDDs

Planned project: big storage with OMV, headless.
As far as I understand, with jbod HDDs are mounted individually, and one can just have 5 HDDs, sdb-sdf, and share 5 drives as 5 indipendent network shares. This setup has the "ability" of knowing what data is on what disk easily. Obviously no raid.
That works on standard debian based distros, so OMV should do it too.
But, if I were to move data from a disk to another, let's say fornet share2 (sda2) to netshare3 (sda3), it won't be done server side; so I tought of mounting each HDD in a folder, and then share that folder through samba/cifs: this should keep the data transfers on OMV box side. I suppose I could share /mount or /media, but I think better leaving sys dir alone...
Is this possible?

mmm, so, nobody knows if this kind of "nested" mountpoint possible?

So, nobody has an idea if this kind of nested mountinf/sharing is possible whith OVM?