GetExplicitEntriesFromAcl

[DllImport("Advapi32.dll", SetLastError = true)][return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetExplicitEntriesFromAcl(
   IntPtr pAcl,
   out uint pcCountOfExplicitEntries,
   out EXPLICIT_ACCESS[] pListOfExplicitEntries
);

Microsoft documentation: Link