Apex domains cannot have CNAME records.
Question and response
Question
dig parktons.com. NS
Answer
parktons.com. 5 NS ns1.anycastdns.cz.
parktons.com. 5 NS ns2.gransy.com.
parktons.com. 5 NS ns2.anycastdns.cz.
parktons.com. 5 NS ns.gransy.com.
Authority
The response has no authority records.
Additional
ns1.anycastdns.cz. 4 A 185.38.108.108
ns2.anycastdns.cz. 4 A 185.28.194.194
ns1.anycastdns.cz. 4 AAAA 2a00:fea0:dead:0:0:0:0:beef
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0