C# Signature:

[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto, BestFitMapping = false)]
//If the value of SECURITY_ATTRIBUTES is NULL, the object is assigned the default security descriptor associated with the access token of the calling process

internal static extern bool CreateDirectory(String path, SECURITY_ATTRIBUTES lpSecurityAttributes);

User-Defined Types:

SECURITY_ATTRIBUTES C#:

    [StructLayout(LayoutKind.Sequential)]
    public class SECURITY_ATTRIBUTES
    {
        internal int nLength = 0;
        // don't remove null, or this field will disappear in bcl.small
        // unsafe is available if compile with /unsafe flag, https://docs.microsoft.com/en-us/dotnet/csharp/misc/cs0227
        internal unsafe byte* pSecurityDescriptor = null;
        internal int bInheritHandle = 0;
        public IntPtr lpSecurityDescriptor;
    }

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