Apex domains cannot have CNAME records.
Question and response
Question
dig ankona.ba. NS
Answer
ankona.ba. 5 NS ns.eu-globaldns.ba.
ankona.ba. 5 NS ns.au-globaldns.com.
ankona.ba. 5 NS ns.eu-globaldns.com.
ankona.ba. 5 NS ns.us-globaldns.com.
ankona.ba. 5 NS ns.cn-globaldns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0