/sbin/mount.cifs 

Usage:  mount.cifs <remotetarget> <dir> -o <options>

Mount the remote target, specified as a UNC name, to a local directory.

Options:
    user=<arg>
    pass=<arg>
    dom=<arg>

Less commonly used options:
    credentials=<filename>,guest,perm,noperm,setuids,nosetuids,rw,ro,
    sep=<char>,iocharset=<codepage>,suid,nosuid,exec,noexec,serverino,
    mapchars,nomapchars,nolock,servernetbiosname=<SRV_RFC1001NAME>
    directio,nounix,cifsacl,sec=<authentication mechanism>,sign,fsc

Options not needed for servers supporting CIFS Unix extensions
    (e.g. unneeded for mounts to most Samba versions):
    uid=<uid>,gid=<gid>,dir_mode=<mode>,file_mode=<mode>,sfu

Rarely used options:
    port=<tcpport>,rsize=<size>,wsize=<size>,unc=<unc_name>,ip=<ip_address>,
    dev,nodev,nouser_xattr,netbiosname=<OUR_RFC1001NAME>,hard,soft,intr,
    nointr,ignorecase,noposixpaths,noacl,prefixpath=<path>,nobrl

Options are described in more detail in the manual page
    man 8 mount.cifs

To display the version number of the mount helper:
    mount.cifs -V