If you have the potential to eventually become their boss, they don't want you.
Everyone looking out for their job security. Unless they are planning a retirement and needed their replacement to be the new face of the company.
That is why downplaying your resume can help you land that job. Once in, be a sneaker, learn his job, excel it and make it better and the boss also has a boss so buddy with that boss. Climbing the corporate ladder baby.