Apex domains cannot have CNAME records.
Question and response
Question
dig fillfound.com. NS
Answer
fillfound.com. 4 NS ns1.fillfound.com.
fillfound.com. 4 NS ns2.fillfound.com.
Authority
The response has no authority records.
Additional
ns1.fillfound.com. 4 A 86.111.188.134
ns2.fillfound.com. 4 A 51.38.144.212
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0