GCS bucket prefix not respected

[lawschlosser]

It doesn't appear that the object path prefix is being respected when mounting a GCS bucket.
Below is an example that uses a public GCS bucket (no credentials required).

# list contents of public bucket
gsutil ls gs://gcp-public-data-landsat/

#    gs://gcp-public-data-landsat/LC08/
#    gs://gcp-public-data-landsat/LE07/
#    gs://gcp-public-data-landsat/LM01/
#    gs://gcp-public-data-landsat/LM02/
#    gs://gcp-public-data-landsat/LM03/
#    gs://gcp-public-data-landsat/LM04/
#    gs://gcp-public-data-landsat/LM05/
#    gs://gcp-public-data-landsat/LO08/
#    gs://gcp-public-data-landsat/LT04/
#    gs://gcp-public-data-landsat/LT05/
#    gs://gcp-public-data-landsat/LT08/

# create a local directory to mount the `/LC08/` subdirectory/prefix to
mkdir -p /tmp/LC08/

# mount the bucket using the `/LC08/` prefix
/src/goofys   gs://gcp-public-data-landsat/LC08/ /tmp/LC08/

The contents of /tmp/LC08/ should reflect that of gs://gcp-public-data-landsat/LC08/, e.g.

ls /tmp/LC08/
#    01  01_$folder$

... but instead, it reflects that of gs://gcp-public-data-landsat/, e.g.

ls /tmp/LC08/
#    LC08  LE07  LM01  LM02  LM03  LM04  LM05  LO08  LT04  LT05 LT08

goofys version

/src/goofys -v
#   goofys version 0.24.0-use `make build' to fill version hash correctly