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Jq: search property by name deep inside unknown input structure and print path

The title says it all: the jq program takes an input JSON document whose structure I am only vaguely familiar with, and I want it to print the path to all the properties inside it that have a specific name.

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Suppose you want to find paths to objects with a key named "b". One approach would be to use paths (objects) as shown here:

def data: {a:{b:1,c:{b:2}}};

data
| paths(objects | has("b") )

Or a little more efficient:

data
| paths
| select( .[-1] == "b" )
| .[:-1]


Call: jq -n -c -f program.jq

Output:

["a"]
["a","c"]
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