One interesting note is that SMB/NFS server-side-copy will by default use block cloning in this release (clones at least initially take no additional space).
Does the client matter? Or as long as the client uses the SMB3 protocol, it doesn't matter if it's Windows, Linux, macOS?
EDIT: Upon second thought, perhaps the file-manager / tool used to issue the "copy" command is what counts, regardless if it's over an SMB3 connection?
EDIT 2: The same question applies for NFS 4.2 clients.
As long as client is properly using SMB protocol to perform a server-side-copy (Windows does this by default in File Explorer. Modern Linux does it via `cp` with --reflink. Mac does Mac things.)