Cargo Features

[dependencies]
rust-unixfs = { version = "0.4.1", default-features = false, features = ["filetime"] }
default = filetime

The filetime feature is set by default whenever rust-unixfs is added without default-features = false somewhere in the dependency tree.

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features.

filetime default