# File lib/fog/aws/requests/efs/describe_file_systems.rb, line 13
        def describe_file_systems(options={})
          params = {}
          if options[:marker]
            params['Marker'] = options[:marker]
          end
          if options[:max_records]
            params['MaxRecords'] = options[:max_records]
          end
          if options[:id]
            params['FileSystemId'] = options[:id]
          end
          if options[:creation_token]
            params['CreationToken'] = options[:creation_token]
          end

          request({
            :path => "file-systems"
          }.merge(params))
        end