We are sensing some K-Fed shade from Sam Asghari ... who hinted at his feelings about Britney Spears ' ex-husband releasing a tell-all book when we caught up with him in Los Angeles Friday.

Check out the clip -- the grinning actor says Kevin is a "professional father" ... adding it'll be "great" for him to share the first-ever book instructing dudes how to be one. Getty

ICYMI ... Kevin announced his upcoming memoir , "You Thought You Knew," earlier this month. It promises to detail the highs and lows of his time in the spotlight along with fatherhood and marriage to the Princess of Pop. He also calls himself "one of pop culture’s most misunderstood figure." Gallery Launch Gallery Getty

Kevin shares 2 kids with Brit -- Sean Preston and Jayden James . H

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