Write a Python program to determine if a given string has balanced parentheses. You are required to implement a function is_balanced that takes a string containing only the characters '(', ')', '{', '}', '[' and ']' and returns True if the parentheses are balanced, and False otherwise. The program should consider the order and nesting of parentheses.

Input: "((({})))"
Output: True

Input: "[()]{}"
Output: True

Input: "({[)]"
Output: False

Answer rating: 100% (QA)

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