Verbose mode, shows the underlying commands being executed by enum4linux
enum4linux -v target-ip
Do Everything, runs all options apart from dictionary based share name guessing
enum4linux -a target-ip
Lists usernames, if the server allows it - (RestrictAnonymous = 0)
enum4linux -U target-ip
If you've managed to obtain credentials, you can pull a full list of users regardless of the RestrictAnonymous option
enum4linux -u administrator -p password -U target-ip