What would you do about this adult man/teenage girl situation?

I was out shopping last night with my teenager and her two friends (sisters, one 15 and one 12). After shopping, they wanted to go to a Mexican chain restaurant nearby where we live. It was around 9 pm so the restaurant had only a few stragglers picking up takeout and we were the only ones eating there.

The three guys who were putting the food together were acting silly and horsing around a little bit. They were talking in a friendly fashion with my daughter’s friends.

When we were sitting down eating, the 12 year old (who looks mature for her age) went over to get something from the counter and one of the guys was talking to her. When she came back to the table, they were laughing about what he said. I asked what he said and she said she’d tell me in the car.

When we got in the car, I asked her what he said and she said he asked her for her “snap” (snapchat contact). She said he gave her his snap and she was saying she would just tell him she’s 12. He’s 18.

Should I tell her parents? The downside is if they confront her, she’ll never trust me with any stuff again. Should I go back to the restaurant and tell the guy that she’s 12 and he needs to back off? Or should I do nothing, because in reality, I don’t know if he is bothering her. If he bothers he, she can block him.

Her father is a cop and I don’t know if he would take too kindly to hearing that an 18 year old is bugging his 12 year old daughter, so I really don’t want to cause drama for anybody, if I can avoid it. If I told the mother, who is a friend of mine, she would no doubt tell the husband (the cop).