Correct, xcp is copying the ".snapshots" folder that is related to the volume snapshot in IBM Spectrum, with the match syntax I reported, the data is not copied but the entire folder structure is created on the NetApp volume.
In robocopy there is the -XD option that would be able to exclude the ".snapshots" folder from the copy to NetApp, I believe the problem is in the xcp syntax -match but I have not found a solution.