A full powershell SMB scanner
Also Useful to get last reboot date/time
The first time, I am trying to play with Tcpclient and SMB.
Tested in production with Windows and no Windows targets.

Get higher SMB dialect and signing setting from a given computer name.

No authentication required
TCP port 445 must be reachable
Not additional powershell module required
Tested on windows 7, 10 and windows 2012 R2
Use same dialect list as Windows 10.

Function used:
    PushToTcpPort
    GetOutput

-ComputerName   : Computer name or IP
-TrustedDomain  : FQDN Domain Name (not used to query only to output reference)
-SMBV1          : Query SMBV1 only
-Verbose        : To display response packet to negotiate query

# SMBV2 and SMBV1 =================
.\Get-SMBversion.ps1  (default current computer)

.\Get-SMBversion.ps1 -ComputerName W2012R2SRV -TrustedDomain contoso.com
Negotiating SMBV2 dialect on:  W2012R2SRV
 SMBV2 Negotiated Dialect   :  SMB 3.2
Negotiating SMBV1 dialect on:  W2012R2SRV
 SMBV1 Negotiated Dialect   :  NT LM 0.12

Domain            : contoso.com
Host              : W2012R2SRV
IsSmbV1           : True
DialectSmbV1      : NT LM 0.12
IsSmbV2           : True
DialectSmbv2      : 3.2
Signing           : 0001
ServerStartupTime : 11/5/2018 2:21:40 PM

# SMBV2 and SMBV1 to host supporting only SMBV2 
.\Get-SMBversion.ps1 -ComputerName smbv2onlyhost  -TrustedDomain contoso.com
Negotiating SMBV2 dialect on:  smbv2onlyhost
 SMBV2 Negotiated Dialect   :  SMB 3.11
Negotiating SMBV1 dialect on:  smbv2onlyhost
 Not any requested dialects found on this host. Timeout: True

Domain            : contos0.com
Host              : smbv2onlyhost
IsSmbV1           : False
DialectSmbV1      : na
IsSmbV2           : True
DialectSmbv2      : 3.11
Signing           : 0001
ServerStartupTime : 10/8/2018 2:53:16 PM

# SMBV1 only ======================
.\Get-SMBversion.ps1 -ComputerName W2012R2SRV -TrustedDomain contoso.com -smbv1 
Negotiating SMB dialect on:  W2012R2SRVT
Negotiated Dialect        :  NT LM 0.12

Domain       : contoso.com
Host         : W2012R2SRV
IsSmbV1      : True
DialectSmbV1 : NT LM 0.12

# Do not support pipeline option but you can use a server array
$server = get-content .\myserverlist.txt
$server | foreach {.\Get-SMBversion.ps1 -computername $_}

Reference:
    https://msdn.microsoft.com/en-us/library/cc246482.aspx
    https://msdn.microsoft.com/en-us/library/cc246561.aspx