Update:
This feature request is now closed and accepted–though not using the problematic VFS_FRUIT technique.
See the feature request here: [Accepted] Enable Mac SMB (Samba) Server-Side Copy Support by Default or Provide a Toggle in SMB Service Advanced Options - #16 by awalkerix
See the JIRA ticket for 25.04.2 (upcoming) here: Jira
EDIT: Also, @awalkerix , I saw your message on the Samba mailing list. Tthanks for working on getting this pushed upstream, too.