PROCESS_MEMBERSHIP_INFORMATION - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTPSAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
// begin_private

//typedef struct _PROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGE
//{
//    ULONG_PTR BaseAddress;
//    SIZE_T Size;
//    ULONG Flags;
//} PROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGE, *PPROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGE;
//
//typedef struct _PROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGES_INFORMATION
//{
//    USHORT NumberOfRanges;
//    USHORT Reserved;
//    ULONG Reserved2;
//    PPROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGE Ranges;
//} PROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGES_INFORMATION, *PPROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGES_INFORMATION;

typedef struct _PROCESS_MEMBERSHIP_INFORMATION
{
    ULONG ServerSiloId;
} PROCESS_MEMBERSHIP_INFORMATION, *PPROCESS_MEMBERSHIP_INFORMATION;

// end_private
#endif
#endif

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This structure is documented in Windows Driver Kit.