children = [
      {
        Proc0,
        []
      },
    %{
      id: SupSup,
      start: {
        Supervisor,
        :start_link,
        [[spec1, spec2], [strategy: :one_for_all, name: SupSup]]
      }
    }
]

opts = [strategy: :one_for_one, name: RootSup]

Supervisor.start_link(children, opts)