How to copy a *.macvm file to a NAS?

I have a copy of all my VMs on a NAS (BTRFS file system with SMB access) but only recently found out that, due to their internal structure, it is impossible to copy *.macvm (Apple Silicon) virtual machines to anything else than APFS file systems.
I guess I could zip the VM file but that woudl take a very long time. Does anybody have a better solution?