Why does the output of testparm differ from /etc/samba/smb.conf?

This is the output of the [global] section of the /etc/samba/smb.conf of a random Synology NAS: ~# cat /etc/samba/smb.conf [global] printcap name=cups winbind enum groups=yes include=/var/tmp/nginx/smb.netbios.aliases.conf min protocol=NT1 security=user local master=no realm=* passdb backend=smbpasswd printing=cups max protocol=SMB3 winbind enum users=yes load printers=yes workgroup=WORKGROUP And this is the output of testparm, which is not identical although it says it loaded this configuration file: # testparm -s Load smb config files from /etc/samba/smb.conf ... [global] passdb backend = smbpasswd printcap name = cups realm = * security = USER server min protocol = NT1 syno catia = Yes winbind enum groups = Yes winbind enum users = Yes winbind expand groups = 1 notify:synotify = yes rpc_server:msftewds = embedded rpc_daemon:wspd = disabled fruit:locking = none rpc_server:mdssvc = embedded rpc_daemon:mdssd = disabled idmap config * : backend = syno include = /var/tmp/nginx/smb.netbios.aliases.conf smb encrypt = if_required strict sync = No I know testparm has this option: -v, --verbose Show default options too This explains for example that it does not return max protocol=SMB3, because it is already the default: # testparm -s -v 2>&1 | grep "max protocol" client ipc max protocol = default client max protocol = default server max protocol = SMB3 But why for example does testparm return the values starting with rpc_ or the line fruit:locking = none. It is not set in the smb.conf. And I can't find it in any other file in /etc, too: # grep -rIils fruit /etc # I mean, yes there is a setting in the GUI which seems to enable the vfs module "fruit", but why isn't it mentioned in any Samba Config file?