#ifndef _NTIOAPI_H
typedef struct _FILE_QUOTA_INFORMATION
{
    ULONG NextEntryOffset;
    ULONG SidLength;
    LARGE_INTEGER ChangeTime;
    LARGE_INTEGER QuotaUsed;
    LARGE_INTEGER QuotaThreshold;
    LARGE_INTEGER QuotaLimit;
    _Field_size_bytes_(SidLength) SID Sid;
} FILE_QUOTA_INFORMATION, *PFILE_QUOTA_INFORMATION;
View code on GitHubThis structure is documented in Windows Driver Kit.