How to mentor future rockstars / 10x engineers?

For some people we can just tell will be 10x engineers. They have a super-solid foundations, a great intuition and an uplifting spirit about problems. For some people, it's harder to make such predictions. Over time, a few will surprise us and become one of the greats.

I would like to know – as mentors, how should we approach this? What are some pitfalls, what are key best practices? Do you have some great stories?

E.g. is hyping up someone that they can be 10x really helpful if they actually can't be 10x?

Note: when referring to 10x engineers, I'm not necessarily saying their output is 10x. Is more a synonym for engineers that are the top 1%