Under solaris the command would be
pkginfo | grep ftp
ps -ef isn't going to show anything for a normal install unless someone is connected. Under that old version of Solaris I think ftp was still set up in /etc/inetd.conf. look for /usr/sbin/in.ftpd or something like that.

My best guess is root is in /etc/ftpd/ftpusers since that is the default.