Apex domains cannot have CNAME records.
Question and response
Question
dig semetris.com. NS
Answer
semetris.com. 5 NS ns-1070.awsdns-05.org.
semetris.com. 5 NS ns-1782.awsdns-30.co.uk.
semetris.com. 5 NS ns-1404.awsdns-47.org.
semetris.com. 5 NS ns-1896.awsdns-45.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0