184.108.40.206 Application Requests to Seek to a Location in a File
The file MUST be held open by the application, and the application MUST provide a Client.Open as well as the desired offset and seek mode.
If the seek mode is 1 (meaning seek from the current position) and the offset is zero, then the application is requesting that the server report the current position of the file pointer (the current offset). Otherwise, the application is attempting to set the current file pointer. SMB_COM_SEEK handles 32-bit offsets only. Also, all Read and Write operations in the protocol set the file pointer, so it is not necessary to use SMB_COM_SEEK for that purpose. SMB_COM_SEEK is listed as obsolescent.