cname.shopify.com has no NS records.
NS records for this zone are defined at shopify.com.
NS records for this zone are defined at shopify.com.
Question and response
Question
dig cname.shopify.com. NS
Answer
The response has no answer records.
Authority
shopify.com. 1800 SOA gold.foundationdns.com. dns.cloudflare.com. 2397344514 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0