Apex domains cannot have CNAME records.
Question and response
Question
dig fmservers.net. NS
Answer
fmservers.net. 4 NS n1.os-ns.com.
fmservers.net. 4 NS ns.os-ns.com.
Authority
The response has no authority records.
Additional
n1.os-ns.com. 4 A 190.183.223.110
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0