When migrating files from a Windows server A to a Samba server B with the command 'net rpc share migrate files -S A -destination=B -acls -attrs -U administrator', some files that originally belong onl

`use acl = yes` enables general ACL support but does not specifically address the issue of mapping *unknown* Windows SIDs to Unix identities during file migration.

`map group acls = yes` is not a standard Samba parameter used for this specific problem; other ACL-related parameters exist but not this exact one.

The `force unknown acl user = yes` parameter in `smb.conf` is specifically designed to handle scenarios where Windows ACLs contain SIDs (Security Identifiers) that do not have a corresponding Unix user or group mapping. Setting this to `yes` forces Samba to map these unknown SIDs to a default or valid Unix identity, preventing errors during migration.

`inherit acls = no` controls whether newly created files or directories inherit ACLs from their parent, which is unrelated to resolving unmapped SIDs during a file migration.