docs: def addFilteringOptions(parser, samfileIsPositionalArg=False):
          """
          Add options to an argument parser for filtering SAM/BAM.
  
          @param samfileIsPositionalArg: If C{True} the SAM/BAM file must
              be given as the final argument on the command line (without
              being preceded by --samfile).
          @param parser: An C{argparse.ArgumentParser} instance.
          """
          parser.add_argument(
              '%ssamfile' % ('' if samfileIsPositionalArg else '--'),
              required=True,
              help='The SAM/BAM file to filter.')
  
          parser.add_argument(
              '--referenceId', metavar='ID', nargs='+', action='append',
              help=('A reference sequence id whose alignments should be kept '
                    '(alignments against other references will be dropped). '
                    'If omitted, alignments against all references will be '
                    'kept. May be repeated.'))
  
          parser.add_argument(
              '--dropUnmapped', default=False, action='store_true',
              help='If given, unmapped matches will not be output.')
  
          parser.add_argument(
              '--dropSecondary', default=False, action='store_true',
              help='If given, secondary matches will not be output.')
  
          parser.add_argument(
              '--dropSupplementary', default=False, action='store_true',
              help='If given, supplementary matches will not be output.')
  
          parser.add_argument(
              '--dropDuplicates', default=False, action='store_true',
              help=('If given, matches flagged as optical or PCR duplicates '
                    'will not be output.'))
  
          parser.add_argument(
              '--keepQCFailures', default=False, action='store_true',
              help=('If given, reads that are considered quality control '
                    'failures will be included in the output.'))
  
          parser.add_argument(
              '--minScore', type=float,
              help=('If given, alignments with --scoreTag (default AS) values '
                    'less than this value will not be output. If given, '
                    'alignments that do not have a score will not be output.'))
  
          parser.add_argument(
              '--maxScore', type=float,
              help=('If given, alignments with --scoreTag (default AS) values '
                    'greater than this value will not be output. If given, '
                    'alignments that do not have a score will not be output.'))
  
          parser.add_argument(
              '--scoreTag', default='AS',
              help=('The alignment tag to extract for --minScore and --maxScore '
                    'comparisons.'))