In the short usage summary(and --help as well) for nmbd:

Usage: nmbd [--usage] [-D VAL] [-i VAL] [-F VAL] [-S VAL] [-H STRING] [-p INT]
        [-d DEBUGLEVEL] [-s CONFIGFILE] [-l LOGFILEBASE]

For smbd:

Usage: smbd [--usage] [-D VAL] [-i VAL] [-F VAL] [-S VAL] [-p STRING]
        [-d DEBUGLEVEL] [-s CONFIGFILE] [-l LOGFILEBASE]

In both cases -p accepts port. so, is it string or int? Or are they different?

Also, in manpages:

       nmbd [-D] [-F] [-S] [-a] [-i] [-o] [-h] [-V] [-d <debug level>]
            [-H <lmhosts file>] [-l <log directory>] [-p <port number>]
            [-s <configuration file>]


Options '-a' and '-o' are not documented.

       smbd [-D] [-F] [-S] [-i] [-h] [-V] [-b] [-d <debug level>]
            [-l <log directory>] [-p <port number>] [-O <socket option>]
            [-s <configuration file>]

Option '-O <socket option>' is not documented...