# File lib/fog/vsphere/compute.rb, line 137
        def parent_attribute path, type
          element = case type
                      when :datacenter
                        RbVmomi::VIM::Datacenter
                      when :cluster
                        RbVmomi::VIM::ClusterComputeResource
                      when :host
                        RbVmomi::VIM::HostSystem
                      else
                        raise "Unknown type"
                    end
          path.select {|x| x[0].is_a? element}.flatten
        rescue
          nil
        end