Create 3 empty MariaDB servers with the following configurations:

This procedure was tested with the MariaDB 10.1.8 Stable deb package available at http://mirror.edatel.net.co/mariadb/mariadb-10.1.8/repo/ubuntu

SETTING: Server_id: 1 | Domain_id: 1 | IP: 10.0.3.223
	STOP ALL SLAVES;
	CHANGE MASTER "M_2" TO
						master_host = "10.0.3.136",
						master_user = "replicator",
						master_use_gtid = slave_pos,
						master_password = "pass",
						do_domain_ids = (2);
	CHANGE MASTER "M_3" TO
						master_host = "10.0.3.171",
						master_user = "replicator",
						master_use_gtid = slave_pos,
						master_password = "pass",
						do_domain_ids = (3);
	START ALL SLAVES;


SETTING: Server_id: 2 | Domain_id: 2 | IP: 10.0.3.136
	STOP ALL SLAVES;
	CHANGE MASTER "M_1" TO
						master_host = "10.0.3.223",
						master_user = "replicator",
						master_use_gtid = slave_pos,
						master_password = "pass",
						do_domain_ids = (1);
	CHANGE MASTER "M_3" TO
						master_host = "10.0.3.171",
						master_user = "replicator",
						master_use_gtid = slave_pos,
						master_password = "pass",
						do_domain_ids = (3);
	START ALL SLAVES;


SETTING: Server_id: 3 | Domain_id: 3 | IP: 10.0.3.171
	STOP ALL SLAVES;
	CHANGE MASTER "M_1" TO
						master_host = "10.0.3.223",
						master_user = "replicator",
						master_use_gtid = slave_pos,
						master_password = "pass",
						do_domain_ids = (1);
	CHANGE MASTER "M_2" TO
						master_host = "10.0.3.136",
						master_user = "replicator",
						master_use_gtid = slave_pos,
						master_password = "pass",
						do_domain_ids = (2);
	START ALL SLAVES;


Wait for all replications to be actually active them issue the following command on server 1:

OPTIMIZE TABLE mysql.user;

This command will be asigned a GTID 1-1-X

After that, look on binlogs of servers 2 and 3. On at least one of them you will find this same command with GTID 2-1-Y or 3-1-Y