People saying its possible for an ummati will surpass our Nabi (SAW)

Assalaam alaikum,

One day i heard my cousin telling my mother that he heard people in the Masjid saying that that Deobandis believe that it is possible for an ummati to surpass our Nabi (Sallallahu Alaihi Wasallam) in practical deeds (amal).
Is this true? If not, how should we reply to such people who are misguiding the innocent people and creating doubts in their hearts and minds?

JazakAllah