This tool is part of the cifs-utils suite.
smbinfo is a userspace helper program for the Linux SMB client file system (CIFS). It is intended to display SMB-specific file informations such as Security Descriptors and Quota.
This tool works by making an CIFS_QUERY_INFO IOCTL call to the Linux SMB client which in turn issues a SMB Query Info request and returns the result. This differs from getcifsacl which uses extended file attributes.
Print version number and exit.
fileaccessinfo: Prints the FileAccessInformation class
filealigninfo: Prints the FileAlignmentInformation class
fileallinfo: Prints the FileAllInformation class
filebasicinfo: Prints the FileBasicInformation class
fileeainfo: Prints the FileEaInformation class
filefsfullsizeinfo: Prints the FileFsFullSizeInformation class
fileinternalinfo: Prints the FileInternalInformation class
filemodeinfo: Prints the FileModeInformation class
filepositioninfo: Prints the FilePositionInformation class
filestandardinfo: Prints the FileStandardInformation class
fsctl-getobjid: Prints the ObjectID
list-snapshots: Lists the previous versions of the volume that backs this file
quota: Print the quota for the volume in the form - SID Length - Change Time - Quota Used - Quota Threshold - Quota Limit - SID
secdesc: Print the security descriptor in the form - Revision - Control - Owner SID - Group SID - ACL - File types - File flags
Kernel support for smbinfo utilities requires the CIFS_QUERY_INFO IOCTL which was initially introduced in the 4.20 kernel and is only implemented for mount points using SMB2 or above (see mount.cifs(8) vers option).
Ronnie Sahlberg wrote the smbinfo program.
The Linux CIFS Mailing list is the preferred place to ask questions regarding these programs.