Question about the Scope and "Inheritance" Behavior of SwiftUI Modifiers

I am confused about the "inheritance" behavior of modifiers in SwiftUI. Some modifiers (such as .background, .clipShape, etc.) seem to affect both parent and child views inconsistently. Here are some specific examples I encountered in Xcode 16.4 with the iOS 18.5 iPhone 16 Pro simulator:

struct ContentView: View {
  var body: some View {
    VStack { // RedVStack
      Text("Hello world!")
      VStack { // OrangeVStack
        Text("Hello")
        Text("Hello")
      }
      .background(.orange)
    }
    .background(.red, in: RoundedRectangle(cornerRadius: 5))
    // RedVStack has rounded corners, OrangeVStack also has rounded corners
  }
}

struct ContentView: View {
  var body: some View {
    VStack { // RedVStack
      Text("Hello world!")
      VStack { // OrangeVStack
        Text("Hello")
        Text("Hello")
      }
      .background(.orange)
      Text("Hello world!")
    }
    .background(.red, in: RoundedRectangle(cornerRadius: 5))
    // RedVStack has rounded corners, OrangeVStack does not have rounded corners
  }
}

struct ContentView: View {
  var body: some View {
    VStack { // RedVStack
      Text("Hello world!")
      VStack { // OrangeVStack
        Text("Hello")
        Text("Hello")
      }
      .background(.orange)
    }
    .background(.red)
    .clipShape(RoundedRectangle(cornerRadius: 5))
    // RedVStack has rounded corners, OrangeVStack does not have rounded corners
  }
}

I find it difficult to understand which modifiers affect child views and which do not. Is there any official documentation or authoritative explanation that can help me understand the scope and "inheritance" mechanism of SwiftUI modifiers? Thank you!