Apex domains cannot have CNAME records.
Question and response
Question
dig gransy.com. NS
Answer
gransy.com. 5 NS sec1.rcode0.net.
gransy.com. 5 NS ns2.anycastdns.cz.
gransy.com. 5 NS ns1.anycastdns.cz.
gransy.com. 5 NS sec2.rcode0.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0