Apex domains cannot have CNAME records.
Question and response
Question
dig smtps.jp. NS
Answer
smtps.jp. 5 NS ns-183.awsdns-22.com.
smtps.jp. 5 NS ns-1092.awsdns-08.org.
smtps.jp. 5 NS ns-879.awsdns-45.net.
smtps.jp. 5 NS ns-1977.awsdns-55.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0