Apex domains cannot have CNAME records.
Question and response
Question
dig filehug.com. NS
Answer
filehug.com. 5 NS ns1.filehug.com.
filehug.com. 5 NS ns2.filehug.com.
Authority
The response has no authority records.
Additional
ns1.filehug.com. 5 A 69.39.239.200
ns2.filehug.com. 5 A 69.65.38.184
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0