# File lib/fog/aws/requests/efs/delete_file_system.rb, line 23
        def delete_file_system(id)
          unless file_system = self.data[:file_systems][id]
            raise Fog::AWS::EFS::NotFound.new("invalid file system ID: #{id}")
          end

          if file_system["NumberOfMountTargets"] > 0
            raise Fog::AWS::EFS::FileSystemInUse.new("")
          end

          self.data[:file_systems].delete(id)

          response = Excon::Response.new
          response.status = 204
          response
        end