File sharing authentication when there is no domain

I have read a lot from msdn but couldn't find anything of this case be covered:
In a Windows (XP, Vista, 7) workgroup, no domain applied, box A shares a folder with username/password (or specifies a user-account), when box B trying to map A's shared folder as local drive, what protocol is being used for authentication, Kerberos or NTLM 2? What configuration should I check if I want to force Kerberos? Any official article from MS about this?

Thank you
sparkythedogAsked:
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sparkythedogConnect With a Mentor Author Commented:
The alternative NTLM protocol is used for authentication if the following conditions exist:
... ...
Computers running Windows 2000 Professional or later and Windows 2000 Server or later use the NTLM protocol to authenticate when they are not participating in a domain–that is, when they operate as stand-alone computers or as part of a workgroup.

from http://technet.microsoft.com/en-us/library/bb457114.aspx
Windows XP Professional Resource Kit
Understanding Logon and Authentication
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rotech_ITCommented:
Active Directory is required for Kerberos authentication.

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kakosiCommented:
You will have to use local groups or local accounts
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sparkythedogAuthor Commented:
Found official Microsoft statement for when NTLM is used instead of Kerberos.
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