How to find parent and child type of a type?

Question

julia> Integer <: Real
true

If we don't know the answer (Real) how to find the supertype of Integer?

Also, how to find all the subtypes of Integer?

user_3990837 · Answer

julia> supertype(Integer)
Real

julia> subtypes(Integer)
3-element Array{Any,1}:
 Bool
 Signed
 Unsigned