Why isn't the variant filter displaying specific product quantities?

I would like to show quantity for one of the product variants only on a product page regardless of which variant is selected. Why does the following code not output anything, no matter what option is selected? Does the where filter work with variant options?

{% assign onem_variants = variants | where: “option1”, “1 Metre” %}

{% for variant in onem_variants %}

{{ variant.inventory_quantity }} metres in stock

{% endfor %}