About decimal part of number reading in Spanish?

About decimal part of number reading in Spanish?

I'm coding a module that transforms number into reading of number.
I asked about basic rule of this, so I get the answer.
Finally I got this,
"3.25387" can be read like "tres punto veinticinco treinta y ocho siete".
I knew that usually in Spanish, decimal part splits by two digits when
reading.
==> Even if "3.25387" can be read also like "tres punto dos cinco tres
ocho siete", but I heard that this is less common than reading by two
digits.
so I type the code like first way(reading by two), but I got in stuck with
trouble.
if I follow the first way, How can I distinguish "1.00001" and "1.000001"??
my results of the number are same. ===> "uno punto cero cero uno"
if I read the two decimal numbers above like "uno punto cero cero uno",
how can you know what the number is?
"1.001"?? or "1.00001"?? or "1.000001"??
So. my questions is what's the best way to read decimal part of number in
my module?
plz, give me a help. Spanish speakers!! T_T