FILE_FS_DRIVER_PATH_INFORMATION - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTIOAPI_H

typedef struct _FILE_FS_DRIVER_PATH_INFORMATION
{
    BOOLEAN DriverInPath;
    ULONG DriverNameLength;
    _Field_size_bytes_(DriverNameLength) WCHAR DriverName[1];
} FILE_FS_DRIVER_PATH_INFORMATION, *PFILE_FS_DRIVER_PATH_INFORMATION;

#endif

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This structure is documented in Windows Driver Kit.